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p = 3x
l = 2x
K = 2(p + l)
200 = 2(3x + 2x)
100 = 3x + 2x
100 = 5x
20 = x
p = 3x
= 3(20)
= 60 cm
l = 2x
= 2(20)
= 40 cm
L = p × l
= 60 cm × 40 cm
= 2.400 cm²
Jadi luas persegi panjang tersebut adalah 2.400 cm²